Sharpening-dies for rock-drills.



C. BROWN. SHARPENING DIES FOR ROCK DRILLS.

APPLIOATIoN FILED AUG. 2, 1909. l 1,053,476. Peteneea Feb. 1s, 1913.

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- e. BROWN. SHARPENNG DIES FOR ROCK DRILLS.

APPLICATION FILED AUG. Z, 1909.

Patented Feb. 18, 1913.

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UNITED sTATEs PATENT oEEioE CARL BROWN, OF DENVER, COLORADO, ASSIGNOR TO THE CHAMPION FORGING MACHINE COMPANY, OF DENVER, COLORADO, A CORPORATION OF COLORADO.

SHARPENINGr-DIES FOR ROCK-DRILLS.

To all whom t may concern:

Be it known that I, CARL BROWN, a citi- Zen of the United States, residing in the city and county of Denver and the State of Colo- ",2 rado, have invented new and useful Improvements in Sharpening-Dies for Rock- Drills, of which the folle-wing, togetherl with the accompanying drawings, constitutes a full, clear, and an exact specification.

This invention relates to dies for sharpening, or renewing, the chisel edges o-n the working face of a cruciform drill bit, such as is generally used in rock drilling, when these edges have become rounded and dull from continued wear. These dies are intended to be furnished principally with the machine for making and sharpening rock drills and for general forging, upon which I have filed an application for U. S. Patent, Serial No. 510,950, bearing even date herewith.

The object of the present invention is to provide a tool for sharpening the chisel edges on rock drills, more quickly and efficiently than is done at present and without the necessity for skilled hand labor. n

`While the primary purpose is to use this invention in connection with the machine referred to, yet these dies may be mounted in an individual framework and used separately in cases where this may seem desirable. The present drawings show these dies as forming a part of the machine above mentioned, but any skilled designer of machinery can readily see how to `construct a simple individual framework containing the necessary elements for a separate machine.

In the accompanying drawings, Figure l is a front elevation of the dies in the working position. Fig. 2, is a view' similar to Fig. l, but showing a drill in section while being operated upon by the dies. Fig. 3, is a partial section on line 3-3, Fig. 1, and Fig. 4, is a section on line 4 4, Fig. l. Figs. 5 and 6, are views upon line a--b looking respectively in the directions of arrows 56 and arrows 65. Fig. 7 is a side view of the point of a cruciform drill bit after its face edges have become rounded and duned.

Referring to the drawings, (3a) and (3b) are parts of the tool wheel disks of my machine, the sleeves (3) and (3d), extending outward, respectively, from (3a) and (3b). In constructing an individual machine, the parts (3a) and (3b) would form a portion Specification of Letters Patent.

Application filed. August 2, 1909.

`ing for the latter. (17S), serve to keep the jaws (7), (7), n0ri Patented Feb. 18,1913.

Serial No. 510,952.

of the framework of the machine and these two parts would, of course, be rigidly connected to each other, so as to allow the proper working of the dies. The block (17D) is the relatively stationary part of the their front faces, these abutments assisting in giving the proper shape to the face of the drill.

(17") is channeled in front of the rolls (4) and to' admit one wing of the drill, allowing its face to just enter between (4) and (17a) is the movable part of the dies and is held normally in the retracted position by the spring (6), which is in compression between pins (3f) and (l7f).

'(7), (7), are movable jaws engaging the dovetailed projections (17X), (17X), which latter' extend along the V-shaped face of (17a), to either side of its vertex. The effeet of the inclines between (17a) and (7 (7),is to cause the movement, outwardly, of (7 (7 when (17) is driven forward.

(175') is a foot projecting from (17a) back of (7 (7 to form a guide and bear- Flat springs (17S),

mally closed. Along the adjacent sides of (7), 7), and centered on their line of parting, is a channel with V-shaped bottom adapted to receive one wing of the crucifor1n. Alongthe faces of (7), (7 are beveled abutments (7a), (7a) corresponding to' abutments and (5a) previously named.

In using these dies, the dull drill is inserted from the front as shown by arrow (24), Fig. 3, its cruciform face resting along the various beveled abutments and in the channels at right angles to the abutments. Vhen (17a) is struck by the hammer (5X) and thereby forced against two opposite wings of the drill, it causes the jaws (7 (7) to be resisted by the drill wings and the pressure exerted between the inclined faces causes (7), (7 to move outward, at the same time drawing the metal of the drill wings away from the center of the drill, and forging the dull drill gradually to the shape indicated by the dotted lines in Fig. 7. )When the dull drill is first inserted into the dies, its rounded face bears on the extreme and adjacent sides of abut-ments (4a) and (5a), causing a one sided pressure on each, and (4a) and (5a) assuming the positions shown in do-tted lines in Fig. 6. Then the jaws (7), (7), draw the drill wings outward, this action serves to gradually bring (4a) and (5a) back into line, the faces of the drill wings being practically hammered between the beveled abutments (4a) and (7s), and (5a) and (7a), forming a sharp chisel edge across the face of the two opposite drill wings. The same operation is repeated on the two remaining drill wings.

An anvil block (9), back of the stationary die, is provided for taking up the shock produced by the striking of the hammer (5x).

Having fully described my invention, what I claim as new, is

1. In sharpening dies for rock drills, the combination with a suitable frame, of a die block and a suitably guided, reciprocating carriage, rolls, adjacent and approximately tangent to each other and socketed in the said die block, spring pressed abutment jaws slidably held along inclined faces on the said carriage, means for driving the said carriage forward and means for automatically retracting the said carriage.

2. In sharpening dies, the combination with a relatively stationary die block, having two adj acent and to each other approximately tangent shaping rolls socketed therein, a movable carriage adapted to be reciprocated in suitable guides, with two movable, spring-pressed, spreading jaws carried by the said carriage, means for drivingtlie said carriage forward and means for automatically retracting said carriage.

3. In sharpening dies, the combination with a suitable frame, of a relatively stationary die block, with two longitudinal adjacent rolls, suitably journaled therein, the said rolls being adapted to form a V-face on the wings of a rock drill, when the said rock drill is forced into the valley existing between the two rolls, a reciprocating carriage moving in guides held by the first mentioned framework, two movable jaws mounted on the said carriage, the said jaws and carriage having inclined faces and guides, means for driving the carriage against the die block, and means for retracting the carriage.

et. In sharpening dies for rock drills, the combination with a relatively stationary die block, suitably supported, of a movable carriage suitably mounted, two longitudinally adjacentrolls, journaled in the die block, the protruding'faces of the said rolls having beveled abutmentfaces, two movable jaws (with beveled abutment faces) mounted on the said carriage, with means for causing the said movable jaws to move laterally outward, when the said jaws are forced againstthe said rolls, means for forcing the said carriage forward and means for retracting the said carriage, as specified.

5. In sharpening dies, the combination ot' two principal, relatively to each other, approachable members, with suitable formers carried by each of the s'aid members, thc formers being so placed that their operating faces oppose each other, the formers in the first of the said principal members, consisting of two rolls, longitudinally adjacent to each other and suitably journaled in the first principal member; the formers in the second principal member, consisting of two movable jaws, having suitable faces to coperatc with the faces of the said opposing rolls, and means for moving the said jaws laterally across the faces of the opposing rolls, when the said jaws are forced against the said rolls, as, and for the purpose specified.

In testimony whereof, I have signed my name to this specification in the presence ot two subscribing witnesses.

CARL BROVN.

Witnesses:

P. H. MALLINCKRODT, IDA B. HAWLEY.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents, Washington, D. C. 

